diff --git a/MailPrintConfig/MailPrintConfig.csproj b/MailPrintConfig/MailPrintConfig.csproj
index dd16daf..4d09e5e 100644
--- a/MailPrintConfig/MailPrintConfig.csproj
+++ b/MailPrintConfig/MailPrintConfig.csproj
@@ -10,10 +10,12 @@
     <AssemblyName>MailPrintConfig</AssemblyName>
     <SelfContained>true</SelfContained>
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.1" />
   </ItemGroup>
 
 </Project>
diff --git a/MailPrintConfig/MainForm.cs b/MailPrintConfig/MainForm.cs
index aa4d363..5d98a89 100644
--- a/MailPrintConfig/MainForm.cs
+++ b/MailPrintConfig/MainForm.cs
@@ -491,6 +491,17 @@ public class MainForm : Form
             ?? Path.Combine(AppContext.BaseDirectory, "appsettings.json");
     }
 
+    private static bool IsServiceRunning()
+    {
+        try
+        {
+            var svc = System.ServiceProcess.ServiceController.GetServices()
+                .FirstOrDefault(s => s.ServiceName == ServiceName);
+            return svc?.Status == System.ServiceProcess.ServiceControllerStatus.Running;
+        }
+        catch { return false; }
+    }
+
     private void BrowseFolder(int rowIndex)
     {
         string? result = null;
@@ -714,6 +725,23 @@ public class MainForm : Form
             Directory.CreateDirectory(Path.GetDirectoryName(path)!);
             File.WriteAllText(path, root.ToString(Formatting.Indented));
             SetStatus($"Gespeichert: {path}", Color.DarkGreen);
+
+            // Dienst-Neustart anbieten wenn Dienst läuft
+            if (IsServiceRunning())
+            {
+                if (MessageBox.Show(
+                    "Konfiguration gespeichert.\n\nDienst jetzt neu starten um Änderungen zu übernehmen?",
+                    "Dienst neu starten?",
+                    MessageBoxButtons.YesNo,
+                    MessageBoxIcon.Question) == DialogResult.Yes)
+                {
+                    _ = ServiceActionAsync("stop").ContinueWith(async _ =>
+                    {
+                        await Task.Delay(1500);
+                        await ServiceActionAsync("start");
+                    });
+                }
+            }
         }
         catch (Exception ex) { SetStatus($"Fehler: {ex.Message}", Color.Red); }
     }
@@ -785,10 +813,10 @@ public class MainForm : Form
 
     private async Task ServiceActionAsync(string action)
     {
-        var publishDir = Path.GetDirectoryName(txtConfigPath.Text) ?? AppContext.BaseDirectory;
-        var exePath    = Path.Combine(publishDir, "MailPrint.exe");
-        var installPs  = Path.Combine(publishDir, "..", "install-service.ps1");
-        var uninstallPs= Path.Combine(publishDir, "..", "uninstall-service.ps1");
+        var publishDir  = Path.GetDirectoryName(txtConfigPath.Text) ?? AppContext.BaseDirectory;
+        var exePath     = Path.Combine(publishDir, "MailPrint.exe");
+        var installPs   = Path.Combine(publishDir, "install-service.ps1");
+        var uninstallPs = Path.Combine(publishDir, "uninstall-service.ps1");
 
         // Bestätigung nur bei Install/Deinstall
         if (action is "install" or "uninstall")
@@ -818,12 +846,13 @@ public class MainForm : Form
             {
                 FileName        = "powershell",
                 Arguments       = $"-NoProfile -NonInteractive {cmd}",
-                UseShellExecute = true,
-                Verb            = "runas",
-                WindowStyle     = System.Diagnostics.ProcessWindowStyle.Hidden
+                UseShellExecute = false,
+                CreateNoWindow  = true,
+                RedirectStandardError = true
             };
 
             using var p = System.Diagnostics.Process.Start(psi)!;
+            string err = await p.StandardError.ReadToEndAsync();
             await p.WaitForExitAsync();
 
             if (p.ExitCode == 0)
@@ -840,7 +869,7 @@ public class MainForm : Form
                 MessageBox.Show(successMsg, "Erfolgreich", MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
             else
-                SetStatus($"'{action}' fehlgeschlagen (Code {p.ExitCode})", Color.Red);
+                SetStatus($"'{action}' fehlgeschlagen (Code {p.ExitCode}): {err.Trim()}", Color.Red);
         }
         catch (Exception ex) { SetStatus($"Fehler: {ex.Message}", Color.Red); }
         finally { DisableServiceButtons(false); RefreshStartStop(); }
diff --git a/MailPrintConfig/Program.cs b/MailPrintConfig/Program.cs
index eec6102..68c48fd 100644
--- a/MailPrintConfig/Program.cs
+++ b/MailPrintConfig/Program.cs
@@ -1,5 +1,12 @@
 using MailPrintConfig;
 
-Application.EnableVisualStyles();
-Application.SetCompatibleTextRenderingDefault(false);
-Application.Run(new MainForm());
+class Program
+{
+    [STAThread]
+    static void Main()
+    {
+        Application.EnableVisualStyles();
+        Application.SetCompatibleTextRenderingDefault(false);
+        Application.Run(new MainForm());
+    }
+}
diff --git a/MailPrintConfig/app.manifest b/MailPrintConfig/app.manifest
new file mode 100644
index 0000000..07e6554
--- /dev/null
+++ b/MailPrintConfig/app.manifest
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="MailPrintConfig.exe"/>
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
+    <security>
+      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
+        <requestedExecutionLevel level="requireAdministrator" uiAccess="false"/>
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+</assembly>